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Originally Posted by Jens
(3) the redshift is a doppler redshift, but has something to do with an expansion or contraction of space itself.
The question I have in this case concerns the third option. Would it be possible, in an infinitely sized and timed cosmos, to have a doppler redshift based on a change in space itself? On one hand, it seems contradictory -- how can everything be expanding in an infinitely large universe?
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Actually, this was another question I wanted to get some feedback on. It doesn't seem easy to me to explain how the cosmological redshift could exist in an infinite universe.